public void OnPageScrollStateChanged(int state)
{
CalendarViewPager pager = null;
if (_weakPager.TryGetTarget(out pager))
{
pager.IsDragging = state == 1;
}
}
public override Java.Lang.Object InstantiateItem(ViewGroup container, int position)
{
CalendarViewPager pager = null;
if (_weakPager.TryGetTarget(out pager))
{
var color = Android.Graphics.Color.Red;
if (position == 1)
{
color = Android.Graphics.Color.Blue;
}
else if (position == 2)
{
color = Android.Graphics.Color.Gold;
}
View view;
switch (position)
{
case 0:
{
view = pager.Item0;
break;
}
case 1:
{
view = pager.Item1;
break;
}
default:
{
view = pager.Item2;
break;
}
}
container.RemoveView(view);
container.AddView(view);
return(view);
}
return(null);
}
public void OnPageScrolled(int position, float positionOffset, int positionOffsetPixels)
{
CalendarViewPager pager = null;
if (_weakPager.TryGetTarget(out pager))
{
var shouldUpdate = false;
if (pager.ScrollX == 0 && !_isInitialized)
{
_isInitialized = true;
pager.SetCurrentItem(1, false);
pager.ScrollX = pager.Width;
shouldUpdate = true;
}
if (pager.IsDragging)
{
if (pager.ScrollX > pager.Width && pager.ScrollX > _previousScrollX)
{
pager.SetMonth(pager.NextMonth);
pager.ScrollX = pager.ScrollX - pager.Width; // right
shouldUpdate = true;
}
else if (pager.ScrollX < pager.Width && pager.ScrollX < _previousScrollX)
{
pager.SetMonth(pager.PreviousMonth);
pager.ScrollX = pager.ScrollX + pager.Width; // left
shouldUpdate = true;
}
}
_previousScrollX = pager.ScrollX;
if (shouldUpdate)
{
pager.Item0.Invalidate();
pager.Item1.Invalidate();
pager.Item2.Invalidate();
}
}
}
public OnPageChangeListener(CalendarViewPager pager)
{
_weakPager = new WeakReference <CalendarViewPager>(pager);
}
public CalendarPageAdapter(CalendarViewPager pager)
{
_weakPager = new WeakReference <CalendarViewPager>(pager);
}
